Ethanol → [2-(4-Ethoxycarbonyl-4-methylpiperidin-1-yl)pyrimidin-5-yl]boronic acid

関与物質

反応条件

反応手順

To 2-chloropyrimidine-5-boronic acid (4.00 g, 25.3 mmol) were added ethyl 4-methylpiperidine-4-carboxylate hydrochloride (4.09 g, 23.9 mmol), ethanol (40 mL) and triethylamine (9.0 mL, 64.0 mmol). The mixture was heated at 80° C. for 3 h before being concentrated in vacuo. The reaction mixture was partitioned between water (100 mL) and ethyl acetate (100 mL), then the aqueous layer was separated and extracted with ethyl acetate (2×100 mL). The organic layers were combined and washed with brine (100 mL), then dried (Na2SO4). The solvent was then removed under reduced pressure and the crude reaction mixture was purified by flash column chromatography on silica (Biotage SNAP 100 g, Isolera). Gradient elution, with 100% dichloromethane to 30% methanol/dichloromethane, afforded the title compound (4.27 g, 43% yield, 74% purity) as a brown oil. LCMS (pH 10): MH+ m/z 294.1, RT 0.652 minutes.

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